# -*- coding: utf-8 -*-
# Part of DTCloud. See LICENSE file for full copyright and licensing details.

import logging

from dtcloud import api, fields, models

_logger = logging.getLogger(__name__)


class AliasMixinOptional(models.AbstractModel):
    """ A mixin for models that handles underlying 'mail.alias' records to use
    the mail gateway. Field is not mandatory and its creation is done dynamically
    based on given 'alias_name', allowing to gradually populate the alias table
    without having void aliases as when used with an inherits-like implementation.
    """
    _name = 'mail.alias.mixin.optional'
    _description = 'Email Aliases Mixin (light)'
    ALIAS_WRITEABLE_FIELDS = ['alias_domain_id', 'alias_name', 'alias_contact', 'alias_defaults', 'alias_bounced_content']

    alias_id = fields.Many2one('mail.alias', string='Alias', ondelete="restrict", required=False, copy=False)
    alias_name = fields.Char(related='alias_id.alias_name', readonly=False)
    alias_domain_id = fields.Many2one(
        'mail.alias.domain', string='Alias Domain',
        related='alias_id.alias_domain_id', readonly=False)
    alias_domain = fields.Char('Alias Domain Name', related='alias_id.alias_domain')
    alias_defaults = fields.Text(related='alias_id.alias_defaults')
    alias_email = fields.Char('Email Alias', compute='_compute_alias_email', search='_search_alias_email')

    @api.depends('alias_domain', 'alias_name')
    def _compute_alias_email(self):
        """ Alias email can be used in views, as it is Falsy when having no domain
        or no name. Alias display name itself contains more info and cannot be
        used as it is in views. """
        self.alias_email = False
        for record in self.filtered(lambda rec: rec.alias_name and rec.alias_domain):
            record.alias_email = f"{record.alias_name}@{record.alias_domain}"

    def _search_alias_email(self, operator, operand):
        return [('alias_id.alias_full_name', operator, operand)]

    # --------------------------------------------------
    # CRUD
    # --------------------------------------------------

    @api.model_create_multi
    def create(self, vals_list):
        """ Create aliases using sudo if an alias is required, notably if its
        name is given. """
        # prefetch company information, used for alias domain
        company_fname = self._mail_get_company_field()
        if company_fname:
            company_id_default = self.default_get([company_fname]).get(company_fname) or self.env.company.id
            company_prefetch_ids = {vals[company_fname] for vals in vals_list if vals.get(company_fname)}
            company_prefetch_ids.add(company_id_default)
        else:
            company_id_default = self.env.company.id
            company_prefetch_ids = {company_id_default}

        # prepare all alias values
        alias_vals_list, record_vals_list = [], []
        for vals in vals_list:
            if vals.get('alias_name'):
                vals['alias_name'] = self.env['mail.alias']._sanitize_alias_name(vals['alias_name'])
            if self._require_new_alias(vals):
                company_id = vals.get(company_fname) or company_id_default
                company = self.env['res.company'].with_prefetch(company_prefetch_ids).browse(company_id)
                alias_vals, record_vals = self._alias_filter_fields(vals)
                # generate record-agnostic base alias values
                alias_vals.update(self.env[self._name].with_context(
                    default_alias_domain_id=company.alias_domain_id.id,
                )._alias_get_creation_values())
                alias_vals_list.append(alias_vals)
                record_vals_list.append(record_vals)

        # create all aliases
        alias_ids = []
        if alias_vals_list:
            alias_ids = iter(self.env['mail.alias'].sudo().create(alias_vals_list).ids)

        # update alias values in create vals directly
        valid_vals_list = []
        record_vals_iter = iter(record_vals_list)
        for vals in vals_list:
            if self._require_new_alias(vals):
                record_vals = next(record_vals_iter)
                record_vals['alias_id'] = next(alias_ids)
                valid_vals_list.append(record_vals)
            else:
                valid_vals_list.append(vals)

        records = super().create(valid_vals_list)

        # update alias values with values coming from record, post-create to have
        # access to all its values (notably its ID)
        records_walias = records.filtered('alias_id')
        for record in records_walias:
            alias_values = record._alias_get_creation_values()
            record.alias_id.sudo().write(alias_values)

        return records

    def write(self, vals):
        """ Split writable fields of mail.alias and other fields alias fields will
        write with sudo and the other normally. Also handle alias_domain_id
        update. If alias does not exist and we try to set a name, create the
        alias automatically. """
        # create missing aliases
        if vals.get('alias_name'):
            alias_create_values = [
                dict(
                    record._alias_get_creation_values(),
                    alias_name=self.env['mail.alias']._sanitize_alias_name(vals['alias_name']),
                )
                for record in self.filtered(lambda rec: not rec.alias_id)
            ]
            if alias_create_values:
                aliases = self.env['mail.alias'].sudo().create(alias_create_values)
                for record, alias in zip(self.filtered(lambda rec: not rec.alias_id), aliases):
                    record.alias_id = alias.id

        alias_vals, record_vals = self._alias_filter_fields(vals, filters=self.ALIAS_WRITEABLE_FIELDS)
        if record_vals:
            super().write(record_vals)

        # synchronize alias domain if company environment changed
        company_fname = self._mail_get_company_field()
        if company_fname in vals:
            alias_domain_values = self.filtered('alias_id')._alias_get_alias_domain_id()
            for record, alias_domain_id in alias_domain_values.items():
                record.sudo().alias_domain_id = alias_domain_id.id

        if alias_vals and (record_vals or self.check_access_rights('write', raise_exception=False)):
            self.mapped('alias_id').sudo().write(alias_vals)

        return True

    def unlink(self):
        """ Delete the given records, and cascade-delete their corresponding alias. """
        aliases = self.mapped('alias_id')
        res = super().unlink()
        aliases.sudo().unlink()
        return res

    @api.returns(None, lambda value: value[0])
    def copy_data(self, default=None):
        data = super().copy_data(default)[0]
        for fields_not_writable in set(self.env['mail.alias']._fields.keys()) - set(self.ALIAS_WRITEABLE_FIELDS):
            if fields_not_writable in data:
                del data[fields_not_writable]
        return [data]

    @api.model
    def _require_new_alias(self, record_vals):
        """ Create only if no existing alias, and if a name is given, to avoid
        creating inactive aliases (falsy name). """
        return not record_vals.get('alias_id') and record_vals.get('alias_name')

    # --------------------------------------------------
    # MIXIN TOOL OVERRIDE METHODS
    # --------------------------------------------------

    def _alias_get_alias_domain_id(self):
        """ Return alias domain value to synchronize with owner's company.
        Implementing it with a compute is complicated, as its 'alias_domain_id'
        is a field on 'mail.alias' model, coming from 'alias_id' field and due
        to current implementation of the mixin, notably the create / write
        overrides, compute is not called in all cases. We therefore use a tool
        method to call in the mixin. """
        alias_domain_values = {}
        record_companies = self._mail_get_companies()
        for record in self:
            record_company = record_companies[record.id]
            alias_domain_values[record] = (
                record_company.alias_domain_id
                or record.alias_domain_id or self.env.company.alias_domain_id
            )
        return alias_domain_values

    def _alias_get_creation_values(self):
        """ Return values to create an alias, or to write on the alias after its
            creation.
        """
        values = {
            'alias_parent_thread_id': self.id if self.id else False,
            'alias_parent_model_id': self.env['ir.model']._get_id(self._name),
        }
        if self.env.context.get('default_alias_domain_id'):
            values['alias_domain_id'] = self.env.context['default_alias_domain_id']
        return values

    def _alias_filter_fields(self, values, filters=False):
        """ Split the vals dict into two dictionnary of vals, one for alias
        field and the other for other fields """
        if not filters:
            filters = self.env['mail.alias']._fields.keys()
        alias_values, record_values = {}, {}
        for fname in values.keys():
            if fname in filters:
                alias_values[fname] = values.get(fname)
            else:
                record_values[fname] = values.get(fname)
        return alias_values, record_values
